How to set dropdown gallery's initial width

I really appreciate your effort on developing Fluent and it has been working great. I am wondering if I missed something because I couldn’t figure out how to set dropdown gallery’s initial width with v2.0.

I know I can set
MaxItemsInRow,
but this will prevent the gallery from being expandable when resized. And I do resize the gallery, it will just add more space instead of expanding the gallery because the max itemsInRow is set. There used
to be a property ItemsInRow in v1.0.

And I also notice
MinItemsInRow
is not working in dropdown gallery. The similar properties
MinItemsInDropDownRow and
MaxItemsInDropDownRowwork correctly.